The e-edition can be downloaded to your computer in e-book format and read even if you are no longer connected to the Internet. E-Book editions are provided in ePub format, and you will need to install software on your computer that can read ePub files. Below are links to a couple of available programs.
Once you've installed some e-book software, visit the downloads page to start downloading e-book editions (you may be asked for your e-edition username and password).